Metal loss testing
Determining metal loss and background noise levels are important steps in designing hearing loop systems to avoid loss of an intelligible signal and to meet the IEC 60118-4 international standard.
To correctly assess an area for metal loss and background noise a temporary loop will need to be used in either a Perimeter loop or figure of eight MultiLoop configuration, depending on the estimated levels of metal in the building structure.
For this you will need a loop driver, a field strength meter, a loop cable, a signal source and a tape measure.
Carrying a full size loop driver around can be cumbersome and impractical to setup every time so Ampetronic developed the HLS-2D Metal Loss Test Driver.
The HLS-2D is a light, portable, loop driver with a preset output level to give consistent test results; and when used in conjunction with the Loopworks Measure R1 or Ampetronic FSM field strength meters, forms part of a quick and simple site assessment system.
Visit the following YouTube videos for Perimeter and MultiLoop test procedures:
HLS-2D Metal Loss Test Kit includes:
- HLS-2D Driver
- 12V power supply
- 2x4mm connectors
- soft case and full instructions
- Compact and lightweight .Ideal for loop testing in all environments.
- Low power consumption
- Quick and simple operation and set up with industry standard connectors
- Test area coverage of up to 45m2
- Low lifetime cost
- Excellent reliability, 5 year warranty and free technical support.
- 12V Power supply. Can be used with a suitable 12V battery (not included) for totally portable testing.
- Transformer isolated inputs
- Preset output level, reducing set up and testing time
- Secure steel enclosure
- Clear and strong signal output
- Can be used to test existing loops and for powering a temporary loop for small shows, exhibitions, talks, etc.
INPUTS
| Power |
Standard format: 12V DC
Connector: 2.1mm DC Power socket, centre positive
Nominal voltage: 12V DC
Fuse: 1.5A PTC
Power Consumption (12V DC supply):
- 2.88W (240mA) continuous pink noise
- 9.2W (765mA) continuous sine
- <0.6W (<50mA) quiescent
- 14.4W (1200mA) max short term peak
Indication:
|
| Input 1 & 2 |
Connector:
3.5mm stereo socket, both audio
channels are combined into the input
signal for the driver. |
OUTPUTS
| Loop Output |
20VRMS (28Vpk) at maximum output current per channel |
| Loop Output |
Connector: 2 x 4mm banana sockets
Preset Output: 2.5ARMS
Rated temperature limited
Output current (pink): 1.5ARMS
Rated time for delivery: 1min
Rated THD: <1%
Output Impedance: >9Ω
Current Indication: LED indicates >1ARMS |
AUDIO SYSTEM
| Frequency Response |
100Hz to 5kHz ±1.5dB relative to 1kHz at low level. |
| Automatic Gain Control |
The AGC is optimised for speech. Dynamic range >36dB
Indication: LED in case |
PHYSICAL
| Dimensions |
Width 77mm
Length 150mm
Height 16mm |
| Weight |
272g |
| Environment |
IP40: <90% relative humidity, -30 to 75 ˚C
Heat dissipation <3W maximum, normally less |
UP37941-1_HLS-2D_flyer
UP37940-2-HLS-2D_datasheet
UP17940-4-HLS-2D_Metal_Loss_Test_Procedure
Test signals can be downloaded here:
Test-Signals
